Which sat nav to buy?

[joemoran7]

I am very much a novice when it comes to sat nav, but I was just wondering if any of you could help me.

I want to buy a sat nav device for my car but have not got a clue which is the best one to buy.

My requirements are:
1, Budget - Max £150
2, I don't quite understand how the updating of the maps happens or even if they do update for new roads etc., but I would like one which you could update without having to buy a new SD card.
3, Very easy to follow instructions

Thanks for any help that you all provide

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